Screen-shoe-actuating means for grist-mills



J. L. SMITH.

. SCREEN SHOE ACTUATING MEANS FQR'GRIST MILLS APPL'ICATION FILED JULY 20, 1918.

Fz'g. Z 35 Patented Mar. 30, 1920.

2 SHEETS-SHEET l- I 20 19 15 I B v La INVENTOR. Jahn L. Smith,

6W ATTORNEY J. L. SMITH.

SCREEN SHOE ACTUATING MEANS FOR GRIST MILLS.

APPLICATION FILED JULY 20,1918.

1,335,464. PafefitedMar. 30,1920.

INVENTOR. Jah n L Sm i672,

- 464 TTORNEY.

iinirnn s'rnrns rarnnr erricn JOHN LEWIS SMITH, OF CEDAR FALLS, IOVI'A, ASSIGNOR T0 DIAMOND GRINDER COMPANY, 013 CEDAR FALLS, IOWA, A COREORATION OF IOWA.

Specification of Letters Patent.

Patented Mar. 30, 192-0.

Application filed July 20, 1918. Serial No. 245,939.

To all whom it may concern Be it known that 1, JOHN Lnwis SMITH, a citizen of the United Eatates, residing at Cedar Falls, in the county of Blackhawk and State of Iowa, have invented certain new and useful Improvements in Screen- Shoe-Actuating Means for Grist-Mills, of which the following is a specification.

My invention relates to improvements in screen shoe actuating means for grist mills, and the object of my improvements is to furnish improved and effective mechanism for actuating a screen shoe to uniformly oscillate it in different directions and at a required rate of speed, while properly supporting it during its actuation.

This invention also constitutes an improvement upon the device, a screen shoe for grist mills, patented in the United States, July 20, 1915, Number 1,147,195.

The above object I have accomplished by the means which are hereinafter described and claimed, and which are illustrated in the accompanying drawings, in which Figure 1 is a side elevation, with a part broken away, of a grist mill and its screen shoe, equipped with my improved means for actuating the screen shoe, and 2 is an elevation of the opposite side of the same;

Fig. 3 is a top plan view of said device, with the mill removed, and Fig. 4 is a detail view of the rear or closed end of the screen shoe, showing its actuating means.

Similar numerals of reference denote corresponding parts throughout the several views. 7

The grist mill 24l--25, and its screen shoe 1, have been described in detail in my said patent, hence will not be again described herein. Said mechanisms are supported and mounted upon an open frame composed of base-boards 30, connected by cross-timbers 10, on both of which are erected the four corner-posts 9, supporting the parallel spaced side-bars 8, the ends of the latter be ing fixedly connected by cross-bars. On said side-bars are the bearing-boxes 23 for the mill-actuating shaft 21, and a countershaft 2 is rotatably mounted in other bearing-boxes 7 on said side-bars 8.

A driving belt-wheel 22 is mounted on an end of the power-shaft 21, and on the opposite end of said shaft (but not shown) is a sprocket-pinion connected by means of a sprocket-chain 28 to a sprocket-wheel 27 on a rotatable shaft26, the latter used to actuate t ie mill. The outer end of the shaft 21 on this side of the frame is supported in a journal box on the fixed support 2 1.

A relatively small belt-wheel 20 is fixed on the power-shaft 21 and connected by a belt 19 with a larger driven wheel 18 on, the counter-shaft 2. In lieu of belt-wheels and a belt as shown, it is obvious that sprocket wheels and a connecting sprocket-chain may be used, the wheels preserving their same relative dimensions of pitch, since the object of their difference in diameter is to more slowly rotate the wheel 18 to properly move the screen shoe 1 at a suitable velocity rela tive to the speed of the burs of said mill.

7 The screen shoel is approximately of the shape'of a rectangular box widened toward its delivery end, and having installed therein a plurality of screens 16 and 17 of different sized meshes, said screens delivering to different tubular exits, as sufiiciently described in my said patent.

The improved actuating means for said screen shoe is described as follows.

The shoe 1 is generally supported in an inclined position longitudinally with its delivery end lower than its closed rear or receiving end. fixed bearing-body 1d transversely orificed to receive the cranked extremity of a swinging arm 15 whose upper bent end is seated to rock in an orificed bearing-block fixed to the under side of one of said side-bars 8. The forward or delivery end. of said shoe is movably supported by a pair of depending eccentric-rods 5 and 29, whose lower cranked ends are pivoted in bracket-bars 6 fixed on opposite sides of the shoe. -The upper ends of these rods are fixedly connected to eccentric-straps 3 and 4 respectively mounted on eccentrics fixed on said shaft 2. A third ec centric-strap 11 is mounted on an eccentric fixed on the same shaft 2 and has an eccentric rod 12, whose rear end is pivoted on a pin 13'extending fixedly from one side of the rear part of said shoe 1.

When the belt-wheel 22 is rotated by a drivingbelt not shown, the mill is actuated when a suitable clutch-mechanism is shifted into engagement to operate its moving parts. Coarsely ground grist is delivered by the mill upon the uppermost and coarsest meshed screen 16 in the shoe 1, and the operation of differently separating the various 011 said receiving end is a- I sized particles of said grist is performed by the plurality of screens in said shoe, when the latter is coordinately actuated by nay-improved actuating means. The eccentricstraps 3 and 4 are moved by their eccentrics to impart up and down movements to the delivery end of the shoe 1, while the third eccentric-strap 11 is moved by its own eccentric to cause its rod 12 to oscillate the shoe 1 longitudinally, the said actions tak ing place simultaneously at the determined speed, resulting in a combined movement or movements whichmost ei'l'ectively actuates the shoe to screen and separate the grist, and deliver the separated components by way ofthe several exists to different receiving receptacles not shown.

It will be seen that the provision of the eccentrics at both sides of the shoe 1 equalizes the supporting and oscillating action thereof on both sides of the shoe, preventingibinding or torsion which would e2:-

, cessively wear or eventually cause breakage of the parts. The other or third eccentric operates the longitudinal oscillation of the shoe at the proper speed due to the relative diameters of said wheels 20 and 18.

This typeof grist mill and its oscillating screen shoe, is thus adapted especially to be power-driven, and is modified in the above particulars from my device of said patent, and the improvements here added render said mechanisms effective in this application of power. 1

Having described my invention, what I claim as new, and desire to secure by Let ters Patent, is:

A gristmill screen located at a point to receive the ground material at one end, a swinging arm having its free end pivotally connected to the feed end of the screen, a rotatable shaft, eccentrics on said shaft positioned over opposite sides of the screen near its delivery end, eccentric-straps on said eccentrics provided with rods whose ends are pivotally connected to opposite sides of the delivery part of the screen, a third eccentric on said shaft, an eccentric-strap on said eccentric provided with a rod whose end is pivotally connected to the feed end of the screen, the said eccentrics being adapted to give'to said screen simultaneous transverse and longitudinal reciprocatory movements.

In testimony whereof I affix my signature.

JOHN LEWIS SMITH. 

